For me, it's too challenging to really absorb me. I can get through levels 1-4 easily. About half the time, I solve level five. I don't know if it's because I get confused, my brain is overworked from the earlier levels, or what. I have yet to solve level 6.
Wow. I get up to level 18 or 19 before I run into any trouble, and then it's usually because the little nodes are too large for the space--there just isn't room in the field to arrange things properly.
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(hovering mouse over the planarity link...)
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(I... bookmarked it. I actually... bookmarked it. I am so screwed.)
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